<template>
  <view>
    <!-- 使用自定义的搜索组件 -->
    <!-- <my-search :bgcolor="'pink'" :radius="3"></my-search> -->
    <my-search @click="gotoSearch"></my-search>

    <view class="scroll-view-contain">
      <scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh+'px'}">
        <block v-for="(item,i) in cateList" :key="i">
          <view :class="['left-scroll-view-item',i===active?'active':'']" @click="activeChanged(i)">{{item.cat_name}}
          </view>
        </block>
      </scroll-view>
      <scroll-view scroll-y="true" :style="{height: wh+'px'}" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
          <!-- 二级分类标题 -->
          <view class="cate-lv2-title">
            /{{item2.cat_name}}/
          </view>
          <view class="cate-lv3-list">
            <view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
              <image :src="item3.cat_icon"></image>
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  import badgeMix from '@/mixins/tabbar-badge.js'
  export default {
    mixins: [badgeMix],
    data() {
      return {
        // 当前设备可用高度
        wh: 0,
        cateList: [],
        active: 0,
        cateLevel2: [],
        scrollTop: 0
      }
    },
    methods: {
      // 获取分类列表的数据
      async getCateList() {
        const {
          data: res
        } = await uni.$http.get('/api/public/v1/categories')
        if (res.meta.status !== 200) return uni.$showMsg()
        this.cateList = res.message
        // 为二级分类赋值
        this.cateLevel2 = res.message[0].children
      },
      activeChanged(i) {
        this.active = i
        // 重新为二级分类赋值
        this.cateLevel2 = this.cateList[i].children

        this.scrollTop = this.scrollTop === 0 ? 1 : 0
      },
      // 跳转到商品列表页面
      gotoGoodsList(item) {
        uni.navigateTo({
          url: '/subpkg/goods_list/goods_list?cid=' + item.cat_id
        })
      },
      gotoSearch() {
        uni.navigateTo({
          url: '/subpkg/search/search'
        })
      }
    },
    onLoad() {
      const sysInfo = uni.getSystemInfoSync()
      this.wh = sysInfo.windowHeight - 50

      this.getCateList()
    }
  }
</script>

<style>
  .scroll-view-contain {
    display: flex;
  }

  .left-scroll-view {
    width: 120px;
  }

  .left-scroll-view-item {
    background-color: #eee000;
    line-height: 60px;
    font-size: 12px;
    text-align: center;
  }

  .left-scroll-view-item.active {
    background-color: #32ff32;
    position: relative;
  }

  .left-scroll-view-item.active::before {
    position: absolute;
    content: '';
    display: block;
    width: 3px;
    height: 30px;
    background-color: #fff;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
  }

  .cate-lv2-title {
    font-size: 12px;
    font-weight: bold;
    text-align: center;
    padding: 15px 0;
  }

  .cate-lv3-list {
    display: flex;
    flex-wrap: wrap;
  }

  .cate-lv3-item {
    width: 33.33%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin-bottom: 10px;
  }

  .cate-lv3-item image {
    width: 60px;
    height: 60px;
  }

  .cate-lv3-item text {
    font-size: 12px
  }
</style>